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Provincial police Chief Mohammad Hussain Andewal said both the children were young boys, but he did not know their ages. The surviving family members told authorities that the two other male victims who died in the explosion were taken away by men riding in two vehicles, Andewal said.

Helmand, Afghanistan's top poppy-producing region, is also among six provinces in southern Afghanistan where international troops continue to battle insurgents.

Last month, a suicide bomb attack at a mosque killed the province's deputy governor. E-mail to a friend